Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b58f8609b6a775b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 13:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76e80573550841d3dca02ec3f96cb487 SHA-1: 84c58279c1f36ae74f5e34a66ae383e3885a18d0 SHA-256: 8b58f8609b6a775bde0ceca67f2f8e7c5af7609fa33165be62460135aa96db8f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that leverages a link farm on compromised websites to direct users to download a password-protected archive. This technique is commonly used to bypass gateway security by encrypting the malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of multiple links to potentially compromised CMS uploads supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cc8446b0f4341df58d077d94babb307a/mowixidolonoxuvu.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130365708fd8.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418dab1ad6b---tipefibajofuroxexunu.pdfIn PDF document text
    • https://phr4u.com/files/xuziwozopirubenisitetez.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/boxefa.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/kaxawopiwujawo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae00a879d---73968485106.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/najixugegetefuzamod.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bepoxaripizabixefesoto.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/gopifavurikazovefagiduv.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111435129278.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/72661470804.pdfIn PDF document text
    • http://metapolar.hu/tmp/44972793278.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/wojapiraturefigixogob.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/kusuvamotejivipekifabiro.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/40406281135.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901111916_yi5gdo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e86f2a460---nidugopikimoxejen.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/benolijezijesij.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/dizojetilozegabutu.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/jixijase.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/rusojovenajaruv.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/20146771102.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/vapovisemozalotorefejopi.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109110520235669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+hard+reset+moto+g7+powerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82C 16056 bytes
SHA-256: c719b1f741e2ea6c22f0f2289b50ffbd6a698d082db54948d512ac235482cc5a
font_01_sfnt_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10724 bytes
SHA-256: 81c3ab2988256297f80cba7f6b59e319b0fd4fba357476102af6ae0e218a1ae2

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